Callback that supplies the current time for TSTInfo genTime.
Nonzero on success, or 0 on failure.
| Name | Description |
|---|---|
| ctx | Response context requesting the time. |
| data | Application pointer supplied to TS_RESP_CTX_set_time_cb(). |
| sec | Output seconds since 1970-01-01 00:00:00 UTC. |
| usec | Output microseconds in [0, 999999]. |